returned to the mine entrance with my tripod and flashlights. I carefully lowered everything down into the hole then carefully placed my feet into it. I lay on my stomach and crawled backwards into the opening. It was about a 45 degree slope of loose gravel and sand from the hole.
I was now facing the doorway which I had been able to see from outside. There were some markings in orange spray paint, and the doorway obviously led to a mining passageway.
I ducked inside the doorway. The passage was about 5 feet in height, making it necessary for me to stoop as I moved through it.